# Codebook for mms_policy_4digit.dta

## Dataset Overview
- Number of Observations: 1,760
- Number of Variables: 11
- Description: Policy variables and indicators

## Variable Descriptions

### `year`
- **Description**: Year
- **Type**: Numeric (integer)

### `id`
- **Description**: Unit ID
- **Type**: Numeric (integer)

### `hci`
- **Description**: Heavy and Chemical Industry (HCI) indicator (0/1)
- **Type**: Numeric (integer)

### `l_i_n`
- **Description**: Logarithm of investment per worker
- **Type**: Numeric (float)

### `l_m_n`
- **Description**: Logarithm of intermediate input costs per worker
- **Type**: Numeric (float)

### `l_costs`
- **Description**: Logarithm of intermediate input costs
- **Type**: Numeric (float)

### `l_inv_tot`
- **Description**: Logarithm of total investment
- **Type**: Numeric (float)

### `l_avg_size_0`
- **Description**: Logarithm of pre-1973 mean avg size
- **Type**: Numeric (float)

### `l_avg_wages_0`
- **Description**: Logarithm of pre-1973 mean avg wages
- **Type**: Numeric (float)

### `l_y_n_0`
- **Description**: Logarithm of pre-1973 mean value added per worker
- **Type**: Numeric (float)

### `l_costs_0`
- **Description**: Logarithm of pre-1973 mean intermediate input costs
- **Type**: Numeric (float)
